With regard to the Caspian Horse (*not* pony - it does not have pony characteristics) as mentioned in the Turkoman thread: the last I heard from the researchers sequencing Caspian DNA, they were coming more and more to the conclusion that the Caspian was not some 'proto-Arab' or transitional breed, but in fact represented a population of Arabian horses that had become miniaturised through isolation and constant inbreeding within a limited gene pool.